log message format test coverage

tests/test_blocks.py

@@ -1,3 +1,4 @@
+import re
 import types
 from unittest.mock import patch
 
@@ -245,3 +246,20 @@ def test_logs_with_compression(self):
                 query = 'SELECT 1'
                 client.execute(query, settings=settings)
                 self.assertIn(query, buffer.getvalue())
+
+    def test_logs_message_format(self):
+        log_regex_source = (
+            r'^\[ .+? \] '                 # hostname
+            r'[\d-]{10} [\d:]{8}\.\d{6} '  # timestamp
+            r'\[ \d+? \] '                 # thread_id
+            r'\{[\w-]{36}\} '              # query_id
+            r'<[a-z]+?> '                  # priority
+            r'\w+?:'                       # source
+        )
+        log_regex = re.compile(log_regex_source, re.I)
+
+        with capture_logging('clickhouse_driver.log', 'INFO') as buffer:
+            settings = {'send_logs_level': 'debug'}
+            query = 'SELECT 1'
+            self.client.execute(query, settings=settings)
+            self.assertRegex(buffer.getvalue(), log_regex)